I am trying to create a progress bar control, what is happening is the OnPaint is never accessed, I have tried the Invalidate, refresh Update etc.. but nothing fires the onpaint event. Anyone have a suggestion ? Thanks Ken Beauchesne private void button4_Click(object sender, System...more >>

Hi Everyone, How big is the device space for a GDI+. For example, if g is a graphics object with no transform, the following will throw a overfloat exception. g.DrawLine(0,0,1000000000,1000000000); I know in GDi it is 2^27, how about GDI+? thanks ...more >>

Hi, Im puzzled about something. I have my own control which I have derived from Panel. In the designer, I get (of course), all of the properties of Panel. I have the BackgroundImage set to a bitmap. Why, if I override the OnPaint method and dont call the base implementation, does the backgr...more >>

Below I list two methods that are part of my application. I don't understand why, in the AddEyeMarkers() method, both versions of the newImage object that I am saving don't contain ellipses that I have drawn using the Graphics.FromImage( newImage ) object. I expected newImage1.jpg to be the sa...more >>

I'm wanting to draw an image (that is 10 x 15 pixels) and tile it horiztonally accross the width of my control (say 250 pixels wide). I'm using the TextureBrush (although I'm not sure if I should be) with a wrap-mode set as Tile. My problem is that I want to position it 10 pixels down (Y), an...more >>

When I use the DrawString method to get an underlined blank space, I can only do so if there are characters to be drawn on both sides of the blank. The following codes gives 3 examples of what I want to be able to do, but only the first one works as desired. How can I get examples 2 and 3 to have...more >>

Hi, For anyone interested, got some timings on copies using different pixel = formats, and the results are (if I've got my methodology right) = surprising. Code below. It loads a file from disk, converts it to the image format specified by = copyFrom and then copies a little bit of it a hundr...more >>

Hi, I would like to know is it possible to display an organization chart in ASP.NET. I have a xml file which contains all the hierarchy details. Please respond to me if there is any software tool available or readily available tool to display this or should we use System.drawing namespace...more >>

Hi, I would like to place an Icon on an Image. If the mouse is over this Icon, I want to display the associated text in a tooltip. How would I do this? Any ideas? My last request wasn't answered so I give it a second try. Best regards, Martin...more >>

Does anyone know how I can take an image opened in a .NET Picturebox (or in an Image or Bitmap object) to hMemDC so that I can deal with that image with regular API functions. Any help is much appreciated. Joe Buchmann...more >>

Hi all You might have heard that Microsoft has published XML Schema for Visio Shapes.I am developing a small app which read from this XML and draw shapes using GDI+.But i am stuck with ellipitical arc .The XML Containes Following data 1. two end points of the arc - ( X1,Y1),(X2,Y2) 2. on...more >>

Hi all, I have a windows application that has icons on the tab pages, however, the icons are not clear and vivid. In other words, the icons look horrible. It has blurry blue/white border. The icons are in .ico type with 16X16 resolution. I have tried to resize the imageindex to 16X16 bu...more >>

Hi, all When I try to paint an image in a larger rectangle (i.e., zoom-in) with DrawImage method of Graphics class, I found that the image looks like it was blurred. In most image processing software, such as PhotoShop, PaintShop, pixels in a magnified image will be shown as rectangles filled ...more >>

What exactly is the pen width? One of the Pen constructors takes a "single" value for the width. That means I can set a pen width of 0.25 and a thicker width of 0.5. How is this related to the pixel width on the screen? I'm running into a problem when I use a Picture Box to show two differen...more >>

I'm trying to diagnose a problem that occurs more easily on certain machines than others, and after some experimenting I'm suspecting that certain video drivers may have difficulty with Regions. Our app is skinned, with rounded edges (via regions) on the app itself and most of the buttons. Each ...more >>

Hi all, I have few tab pages on my application and I need the icon for the tab pages to be in the middle since the default has the icon being more towards the left. Any suggestion would be greatly appreciated. Thank you in advance. regards, Sean...more >>

Hi, I have a control which is inherited from user control. In my control, there is a public sub method that will do something and then call the invalidate() inside that method. But unfortunately, I find that even if I have the invalidate() inside the method, OnPaint is not called. But if I put...more >>

I'm using the Image.FromFile method repeatedly in an application where users need to delete, rename, and move files from folder-to-folder by point-and-click. According to the Visual Studio Doc., the file an image is obtained from remains reserved until such time as the image object is Disposed of...more >>

Hello, I'd like to replace a color in an image but I have no clue how I'd go about doing this. I've tried changing the palette color but it didn't work, or I did something wrong. The image in question is in index colors and is loaded into an ImageList. Could someone point me in the right d...more >>

I'm at the point where I am successfully rendering graphics to the screen and also to the PrintPreviewDialog (sending the appropriate Graphics object to a Draw routine). This all works correctly until I do a Print Preview and THEN maximize the Print Preview dialog. The display draws EXTREMELY sl...more >>

How does one ensure that text drawn on a Graphics object is always the same size (font height) irrespective of the Graphics Transformation? i.e. If I specify a 12 point font, I want it to appear to be 12 points in height even if I re-scale the Graphics Transform. ...more >>

I have an image with PixelFormat.Format24bppRgb I want to convert in tif black & white. I know to use encoder image/tiff and CompressionCCITT4 parameter to save in tif but I don't know to transform PixelFormat.Format24bppRgb to bitonal before using image.Save Thank's for your help ...more >>

Hey, I've been trying to mess around with the alpha channels in PNGs, and I've run over a rather strange (IMO) "feature". I want to know, how I can step around this. I'm removing the alpha channel, found in the PNG image, but depending on what DrawImage method I use, I get differing behavio...more >>

Hi, Is there a known problem using DrawImage to scale an image? We're using it to plonk little tiles down (100 X 100) pixels and especially at non-integer scaling, we're experiencing some horrible tearing and missing pixels. It especially seems to be a problem above 1000%, and more so towards ...more >>

Hi, This might be a stupid question, but is there a simple way to tell what kind of colour space image a System.Drawing.Image is holding? PixelFormat doesn't seem to do it - its options only include various RGB values and then some other vague names. Thanks, Steve ...more >>

Hi All, I would like to draw a line which should display then disappear on a timer. Should I use an XOR pen mode ? or other ? On unix X Window, I used GxXor, but on DotNET I can't find anything equivalent. ...more >>

Can anyone confirm whether this is a bug in the IsVisible method if the Region class? Region r = new Region(); r.MakeEmpty(); r.Union(new Rectangle(new Point(0, 0), new Size(160, 24))); r.Union(new Rectangle(new Point(0, 48), new Size(160, 24))); bool a = r.IsVisible(new Rectangle(new Po...more >>

I tried to display a 2M jpg, I found that the OnPaint method is keeping calling continuously and the page faults count of the application keep increasing... I just used e.Graphic.DrawImage(this.Image, this.location.X, this.location.Y, this.width, this.height); to paint the image what's wron...more >>

I am drawing some shapes on the scrollable panel using GDI+. The panel may grow vertically or horizontally according to the shape positions. I have to print these drawings on the panel. I tried capturing the screen shot of the panel but it working only for the visible area (won't cover the scr...more >>

We've added the opentype font 'Myriad' to our windows install. There are several variations. These fonts do not show up in the System.Drawing.FontFamily.Families array. I wrote a quick Visual C++ app to use the EnumFontFamilies() WINAPI to get a list of fonts and they show up. There's got to ...more >>

I'm writing an application which amongst other things generates 2D charts: what I'd like to be able to do is provide feedback to the user of the coordinate position when the mouse is moved within the graph region. The way I've done it using interop is IMO messy (and GDI leak potential is very...more >>

Regardless of how a control is invalidated, the "Clip" region of the Graphics object within the PaintEventArgs always seems to be infinite. This is counter to the Win32 behavior which would ensure that the clipping region of the HDC returned by BeginPaint would contain the former update region....more >>

I can't seem to figure out why I can't StretchBlt an image that I have loaded from my hard drive. There are two button events below. The first button event, btnFormStretch_Click, works fine, but the second one, btnStretch_Click, does not. The only difference seems to be the way that I get th...more >>

Hi there! I am looking for a possibility to draw e.g. a circle or rectangle with some text in it (VB.NET and GDI+). The text will be moving, but must never exceed the edges of the circle/rectangle. So the text should be "cut off" at the edges of the surrounding circle/rectangle. Can anyone ...more >>

Hi, I am trying to map a font name to the filename in windows/fonts directory. This needs to be in a CSharp program. The user can change the font using FontDialog or a editing a dataset. The font names currently needing mapping are: arial arial black microsoft sans serif cosmosbq-ligh...more >>

Hi! When using the Full Framework, it's quite easy to get the handle of a bitmap object: Private _bmp As System.Drawing.Bitmap Private _graphics As System.Drawing.Graphics _bmp = New System.Drawing.Bitmap(100, 100) _graphics = Graphics.FromImage(_bmp) Dim hDC As IntPtr hDC = _grap...more >>

Hi, anyone know how to use donet to do the things Draw3DRect? thanks Jessie ...more >>

Hi, I have a problem drawing lines (with the Pen object) on a derived Panel when I scale the graphics object in OnPaint. It only happens when i scale down (or zoom out). e.Graphics.ScaleTranstorm(0.5F, 0.5F); // for example The problem is that sometimes when a line is drawn on or very close...more >>

Hi, I couldn't draw text with postscript font using GDI+. Although I could use GDI to set the postscript font however when I began to draw text with drawstring() function, it complained that the font needed to be true type font. Can anyone help me. Is there a software that convert postscript t...more >>

Hi all, Does anyone have a nice way of drawing elliptical arcs on a GraphicsPath? That is, an arc between two points, given vertical and horizontal radii, and a 'large angle flag' and 'sweep flag', such as in SVG. I'm really asking if anyone has an idea of how to position the control poi...more >>

Hi, Does anyone have any performance info on the above function? Specifically I'm interested in the relative performance of, say, copying an image into another in tiles versus copying in one go. A test I just ran came up with the following: Filling a 1000 X 1000 destination from the sam...more >>

I know I don't often ask questions on this forum :-)) but... Has anyone *ever* managed to make Image.SelectActiveFrame work with FrameDimension.Page?? I have created scads of multi-page TIFF images but only ever read them with the MS Fax Viewer application. I find that when I load them in an...more >>

Hi guys, I'm looking for the DrawFocusRect() equivalent in .NET if there is such a thing... Thanks! Jens...more >>

Hi, We're writing an application that has to be able to load 24 and 48 bit TIFF files. Image.FromFile seems to be fine with the stuff we've thrown at it, except that 48bit TIFF files saved in Adobe's Photoshop are a factor of 8 too dark. We know from experience with Adobe's SDK that they repre...more >>

Hi! I just became aware that on my b/w Pocket PC device all colors are transformed to gray if I use e.g. Drawing.Graphics.FillRectangle. I thought they won't be transformed before the bitmap is written on the display. Is this behaviour a feature of .Net (Compact Framework) or depends it o...more >>

Hi, Is it possible to set the width for a piece of multiline text and then to determine it's height? I would like to display some text in a label of a fixed width and set the label height to display the text fully without wasting anyspace. Is there an easy way to do this? Many thanks in ...more >>

Hi, I am still searching for a way to create snapshots from a System.Windows.Forms.Control without copying the picture information of the screen, because the snapshot shall also be taken from a control that is not visible on the screen. Now I found some COM-example realizing this task by u...more >>

Hello Bob, after I convert an TIFF file, obtained from Windows 2000 Fax Service, the new file has no tag 266 any more and has the tag 254 with value 0 instead of 2. Do you know a way - how can I set some tag like 254 - how can I add some tag, that the original image doesn't have? Regards, ...more >>

Heya! To start out with, I know nothing about GDI+, except that it has a + in it. I'm working on an image editor for an online application coded in VB ASP.NET. The purpose is to be able to upload a scanned image (document) to the server, and then have users highlight / black out sections o...more >>

Hi everyone! Can anyone show me or point me in the right direction on how to create an EPS image file in C#? I've tried creating bitmaps and jpeg files but I need to create an image file in an EPS file format for printing graphs. Thanks, Phong ...more >>